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cos(11)/(7)cos(2 pi cos4 pi)/(7)...

cos(11)/(7)cos(2 pi cos4 pi)/(7)

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Prove that: cos(pi)/(7)cos(2 pi)/(7)cos(4 pi)/(7)=-(1)/(8)

The value of cos (pi)/(7) . cos (2 pi)/(7) . cos (4 pi)/(7) is

cos(pi/7)cos((2pi)/7)cos((4pi)/7)=

Prove that: cos(pi/7)cos((2pi)/7)cos((4pi)/7)=-1/8

Prove that: cos(pi/7)cos(2pi/7)cos(4pi/7)=-1/8,

Find the value of cospi/7+cos(2pi)/7+cos(3pi)/7+cos(4pi)/7+cos(5pi)/7+cos(6pi)/+cos(7pi)/7

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Prove that 4cos(2 pi)/(7)*cos(pi)/(7)-1=2cos(2 pi)/(7)

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The value of cos (2 pi)/(7)+cos (4 pi)/(7)+cos (6 pi)/(7) is